/in/foo.c: In function 'main':
/in/foo.c:9:14: error: expected expression before ',' token
  loop:if(s>k),printf("%d",n);
              ^
/in/foo.c:9:14: warning: left-hand operand of comma expression has no effect [-Wunused-value]
/in/foo.c:9:2: warning: label 'loop' defined but not used [-Wunused-label]
  loop:if(s>k),printf("%d",n);
  ^~~~